The 9th digit in the 17 digit VIN is called the check digit. The check digit is used to validate the VIN number. The check digit is calculated based on the other 16 alphanumeric values in the vehicle VIN.

The possible values for the check digit range from 1 through 9 and also include the letter X. Each position in the 17 digit VIN has a numerical value assigned to it. The 9th digit's position (check digit) has a value of 0, so it does not affect the calculation. Each alphanumeric character also has a numeric value. See the tables below for the numeric values for each character and position.

This is the formula used to calculate the check digit:

1. Multiply the numeric value of the first VIN position by the numeric value of the alphanumeric character present at that position and write the sum down on a piece of paper.

2. Repeat step 1 for all 17 VIN positions.

3. Add all 16 values obtained in steps 1 and 2 to get a total number value.

4. Divide the total number value obtained in step 3 by 11. Do not use a calculator. You must use old fashion long division on a piece of paper. If the remainder of the division in step 4 is 10, use X as the check digit. Otherwise, use the remainder of the division (0 - 9) as the check digit.

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